1.Nd7
[1.Nc8?
Bg2
2.Bf8
Nb5
3.Nd7
(3.Nc4
Bd5
4.Kd3
Be6
5.N8d6
Nxd6
6.Bxd6
Bxc4+
; 3.Bc5
Bh3
4.Ne7
Nc3+
5.Kd3
Na4
6.Bf2
Nxb6
) 3...Nd4+
4.Kd3
Bh3
5.Nb8+
(5.Nc5+
Kb5
6.Nxb7
Bxc8
7.Nd6+
Kxb6
8.Nxc8+
Kc7
) 5...Kb5
6.Nd6+
(6.Kxd4
Bxc8
7.Bc5
Be6=
Zugswang) 6...Kxb6
7.Kxd4
Kc7
]
1...Nc4
[1...Bg2
2.Bd4
Nc4
3.Kd3
Nxb6
4.Bxb6
Bh3
5.Kc4
leads to the main line]
2.Bd4
[2.Nc8?
Bg2
3.Bd4
(3.Nb8+
Kb5
4.Bd4
Bh3
5.Na7+
Ka5
6.Nbc6+
Ka6
7.Nb4+
Ka5
8.Nd5
(8.Nac6+
Kb5
) 8...Be6
9.Nc6+
Kb5
10.Nce7
(10.Nc7+
Kxc6
11.Nxe6
Kd5
; 10.Ncb4
Nxb6
11.Bxb6
Bxd5
12.Nxd5
Kc6
) 10...Bxd5
11.Nxd5
Kc6
12.Ne7+
Kd7
13.Nd5
Kc6
14.Nb4+
Kb5
15.Nd5
Kc6
with a merry go round draw by repetition) 3...Bh3
4.Nb8+
Kb5
5.Na7+
Ka5
6.Nbc6+
Ka6
7.Nb4+
Ka5
8.Nd5
Be6
9.Nc6+
Kb5
10.Nce7
(10.Nc7+
Kxc6
11.Nxe6
Kd5
12.Kd3
Kxe6
draws) 10...Bxd5
11.Nxd5
Kc6
12.Ne7+
Kd7
13.Nd5
(13.Kd3
Kxe7
14.Kxc4
Kd7=
) 13...Kc6
14.Nb4+
Kb5
15.Nd5
Kc6
with a positional draw]
2...Nxb6
this sacrifice gives Black a fighting chance otherwise he will be overwhelmed or mated [2...Nd6
3.Kd3
Be4+
4.Kc3
Ka5
(4...Bf5
5.Ne5
Ka5
(5...Be6
6.Kb4
Nf5
7.Bc5
) 6.Nc4+
Nxc4
7.Kxc4
Be4
8.Kc5
) 5.Ne5
Nb5+
6.Nxb5
Kxb5
7.Kd2
Bd5
8.Ke3
aiming for Kc7 winning; 2...Bg2
3.Kd3
Bf1+
(3...Bd5
4.Kc3
Ka5
(4...Nd6
5.Kb4
Ne4
6.Nb8#
) 5.Bc5
Bg8
(5...Be6
6.Bb4+
Ka6
(6...Ka4
7.Nc5#
) 7.Nc5+
Kxb6
8.Nxe6
; 5...Ka4
6.Bb4
Nxb6
7.Nxb6#
; 5...Ka6
6.Kb4
Nxb6
7.Nb5
Nxd7
(7...Bc6
8.Nb8#
) 8.Nc7#
) 6.Nc6+
Ka4
7.Nd8
Kb5
8.Bf2
Nd6
9.Kd4
Nc8
10.Ke5
Ka6
11.Nf6
Bb3
12.Ne8
Nxb6
13.Nc7+
Ka7
14.Nde6
Bxe6
15.Kxe6
wins the knight) 4.Kc3
Na3
(4...Nd6
5.Kb4
Ne4
6.Nb8#
; 4...Na5
5.Nb8#
) 5.Kb3
Nb5
(5...Nc4
6.Nc5+
Kxb6
7.Nd3+
Kc7
8.Kxc4
) 6.Bc5
Bh3
7.Nb8+
Ka5
8.Nbc6+
Ka6
9.Nb4+
Ka5
10.Nac6+
bxc6
11.b7
queening; 2...Bd5
3.Kd3
Nd6
4.Kc3
Ka5
5.Be5
Nb5+
6.Nxb5
Kxb5
7.Bc7
Be6
8.Nf6
Kc5
(8...Kc6
9.Kd4
) 9.Kd3
Bf5+
10.Ke3
Bg6
11.Kf4
Kb5
12.Ke5
and White infiltrates]
3.Bxb6
Bf3+
4.Kd3
Now the White king must do some fancy footwork. [4.Ke3?
Bg4
5.Kd4
Be6
and White is in Zugswang; 4.Kxf3?=
stalemate]
4...Bg4
has Black found a drawing resource despite his two piece deficit?
5.Kc4
[5.Kd4?
Be6=
Zugswang]
5...Be6+
[after 5...Bxd7
obviously 6.Kc5+-
]
6.Kd4
[6.Kc5?
Bxd7=
]
6...Bh3
7.Kd5
Bg4
8.Kd6
Bxd7
[8...Bh3
9.Nc8+-
]
9.Kc5
Be8
[9...Bg4
10.Nb5
Bd7
11.Nc7#
]
10.Nc8
and the slower knight outmanoeuvres the fleeter bishop, for example
10...Bc6
11.Nd6
Bd7
12.Nc4
Bc6
13.Ne5
Bb5
14.Nf3
Bd7
15.Nd4
Bf5
16.Nb5
Bd3
17.Nc7#
1-0